I do not recommend yet to install on Android 8, did not adapt yet;)

Large digits of hours and days of the week, dates on the screen.
The time of the set alarm.
If you click on the clock icon, the alarm setting will start.
When you click on the time digits, the date and time setting starts

To set the widget: long press the screen, select the Widgets icon, find "Big clock" or "Large clock", click on it and hold down to choose a place on the screen.